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| Bloomers and cock ups learning to cut thread on the lathe |
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| DavidA:
It is interesting how the set-over top slide is being referred to as the correct way to cut a thread. At work we have two CNC lathes. One is a Guildermeister (can't remember what the other is; I don't use it) and this machine uses a straight in approach. It gradually reduces the depth of cut as it goes. Same goes for the other machine. Can anyone recall a CNC thread cutting lathe that uses set-over ? Not wishing to pour petrol on the fire here, just curious. Dave. |
| Stilldrillin:
--- Quote from: DavidA on July 19, 2013, 08:43:04 AM ---Can anyone recall a CNC thread cutting lathe that uses set-over ? --- End quote --- Haas, Mazak(x5!), Mori Seiki, Tos. :thumbup: ......... Nope! :scratch: David D |
| mosey:
Beginner here! On page 77 of "How to run a lathe", South Bend Lathe Co., it says under "position of compound rest for cutting screw threads". "in manufacturing plants where maximum production is desired, it is customary to place the compound rest of the lathe at an angle of 29 degrees for cutting screw threads." This is obviously relevant to 60 degree threads. Is this what you mean when you say "setting the top-slide over"? It works for me. Also, in questioning several professional machinists, they've never used a threading stop. Curious. I find that stops frequently slip, ruining the thread. :med: Mosey |
| unc1esteve:
Bangkok Mick, I purchased the book by Tom Walshaw, Model Engineer's Handbook from The Book Depository. Thought he might have a step by step description of screw cutting but he did not. I liked it so I purchased five more of his books. This is a good source and the free world wide shipping is very good. Habits are difficult to change. I built a Bonelle T&C Grinder to sharpen tools but find I still sharpen by hand. The T&CG sharpened tool makes a much more smooth and accurate cut. I am forcing myself to use the Bonelle first, even if only for a touch up. |
| Bangkok Mick:
Hi Steve, I also used the Book Depositary and living in Bangkok appreciated the free postage service. Cheers Mick |
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